Centrifugal pump



A rilz'z, 1930. QJACOB EN 1,755,217

' .CENTRIFUG'AL PUMP 1 Filed March 6, 1929 2 Sheets-Sheet 1 April 22, 1930. o. JACOBSEN I CENTRIF'UGAL PUMP Filed March 6, 1929 2 Sheets-Sheet 4 2 7/ ll/filly Patented Apr. 22, 1930 UNITED STATES PATENT OFFICE OYSTEIN JACOBSEN, OF DAYTOLL'OHIO, ASSIGNOR TO THE DURIBON COMPANY, INC.,

1 A CORPORATION OF NEW YORK CENTI QIIFUGAL PUMP Application filed March 6,

. ation (with'the pump casing free from air) gible amount.

in a minimum of time. A further object is to provide a structure of the kind specified, wherein the quantity of water circulated through the priming passage after the pump is in normal operation, is reduced to a negl1- One embodiment of the invention is illustrated in the accompanying drawings, wherein: a

Figure 1 is a side elevation partly in section. Fig. 2 is arear elevation with the suction elbow removed. Fig. 3 is an enlarged vertical section on the line III-III of F 1g. 2. Fig. 4 is a section on the line IVIV of Fig. 3. Fig. 5 is a plan view of the lower end of the casting shown in Fig. 3. Fig. 6 is a section on the line VI-VI of Fig. 4. And

Fig. 7 is a section on the line VIIVII of Fi 1.

fieferring to the drawings, 1 and 2 areparts of the pump casing bolted together; 3 is the drive shaft provided at one end with the 1mpeller or runner 4 and at the other end the pulley 5; and 6 is the suction elbow having at its upper end a priming opening provided with a cover 7 suitably secured in place.

Leading upward fromthe volute 8 of the casing is a passage 9 of the cross section ind cated in Fig. 7, and alongside this passage is a smaller passage 10. which with the pipe 11 (into which it leads) constitute the priming passage which functions as later described. This pipe'has its end turned laterally in allnement with the axis of rotation of the runner so that it discharges through the inlet eye 12 of the casing.

Mounted above the pump casing is what may be termed the separation chamber 13. This chamber is provided with two passages 9 and 10" having the same cross section as the passages 9 and 10 respectively (Fig. 7 and constituting continuations thereg f. The passage 9 has its walls flared outwardly upper end of the chamber. starts, there is only a slight amount of back 1929. Serial No. 844,714.

(Fig. 3) and terminates midway between the ends of the chamber 13., The upper end of the chamber is contracted and'fianged and constitutes a part of the outlet conduit or pipe leading from the pump. Between the upper end of the pipe or passage 9 and the end of the pipe 14 is a spreader 15 of conical shape integral with the chamber casting and supported therefrom by the four ribs 16, 16, 16, 16. A port 17 serves to connect the passage 9 with the upper section 10 of the priming passage.

When the pump is primed, the liquid lies at about the level A, filling the elbow 6 and the volute. The pump is then started, and the action'of the runner withdraws the liquid in the elbow and forces it up to the port 17. A part of the liquid thus raised flows through the port 17 into the passage 10 and then passes down by gravity through the priming conduit made up of the passages 10,

'10 and 11. Another portion of the water lifted by the action of the runner flows up past the port 17 where it passes over the top of the passage 9 and moves by gravity downward through the passages 10, 10 and 11. The priming liquid-is thus supplied at the center of the runner, and is carried out to the volute, and up again through the passages 9 and 9*. The discharge from the passage 11 carries with it some of the water and air in'the elbow. and as this circulating action is continued, the air is soon exhausted from the elbow and the suction pipe connected thereto, causing these parts to fill with water. When this occurs, the chamber 13 is completely filled with water under pressure. This provides an upflow through the outlet pipe at the After this action flow through the priming conduit, as the port 17- permits the water flowing upward through the passage't) to exercise a dr gmpon the water in the passage 10 counteracting to a large extent the gravity flow, which would otherwise occur through such passage 10. The eflicieney of the pump is thus onlyslightly= reduced incident to the self priming construction. With the construction as de scribed and illustrated, the normal flow from the pump, after starting, is established in less than half a minute, which is substantially less than that required with the construction of my prior application heretofore referred to. The construction is simple throughout, has a minimum number of parts, and may be readily constructed throughout of acid resisting castings, such as high silica iron.

W hat I claim is:

1. In combination in a centrifugal pump, a casing having an inlet eye at its center and a volute around its periphery, a separation chamber mounted above the pump, a discharge pipe leading fromtheevolute to a point intermediate the ends of the chamber, an outlet pipe leading from the upper end of the chamber, a conical spreader member between the upper end of said discharge pipe and said outlet pipe, runner or impeller mounted for rotation in the casing with its axis of rotation in line with the'inlet eye, a suction elbow with an enlarged end cavity in opposition to and surrounding said. inlet eye, and a priming conduit leading down from the chamber into said elbow with its end turned lateraly in alinement with the axis of rotation of the runner and in opposition to said eye.

:2. in combination in a centrifugal pump,

a casing having an inlet eye at its center and a volute around its periphery, a separation chamber mounted above the pump, a discharge pipe leading from the volute to a point intermediate the ends of the chamber, an outlet pipe leading from the upper end of the chamber, a runner or impeller mounted for rotation in the casing with its axis of rotation in line with the inlet eye, a suction elbow with an enlarged end cavity in opposition to and surrounding said inlet eye, and a priming conduit leading down from the chamber into said elbow with its end turned laterally in. alinement with the axi of rotation of the runner and in opposition to said eye, a port being provided through the wall of the discharge pipe into the riming conduit adjacent the bottom of sai chamher.

3. In combination in a centrifugal pump, :1 casing having an inlet eye at its center and a volute around its periphery, a separation chamber mounted above the pump, a discharge pipe leading fromthe volute to a point intermediate the ends of the chamber, an outlet pipe leading from the upper end of the chamber. a runner or impeller mounted for rotation in the casing with its axis of rotation in line with the inlet eye, a suction elbow with an enlarged end cavity in opposition to and surrounding said inlet eye, and a priming conduit leading down from the chamber into said elbow with its end turned laterally in alinement with the axis of rotation of the runner and in opposition to said eye, a downwardly inclined port being provided through the wall of the discharge pipe into the priming conduit adjacent the bottom of said chamber.

4. In combination in a centrifugal pump a casing having an inlet eye at its center and a volute around its periphery, a separation chamber mounted above the pump, a discharge pipe leading from the volute to a point intermediate the ends of the chamber, being flared to an increased diameter at its upper end, a spreader in the chamber above said upper end, a runner or impeller mounted for rotation in the casing with its axis of rotation in line with the inlet eye, a suction elbow with an enlarged end cavity in opposition' to and surrounding said inlet eye, and a priming conduit leading down from the chamber into said elbow-with its end turned laterally in alinement with the axis of rotation of the runner and in opposition to said In testimony. whereof, I have hereunto subscribed my name this 1st day of March,

o. JACOBSEN. 

